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Date: 17-4-2017
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Date: 17-4-2017
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Date: 24-4-2017
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Moles: Putting Avogadro’s Number to Good Use
When people deal with objects, they often think in terms of a convenient amount. For example, when a woman buys earrings, she normally buys a pair of them. When a man goes to the grocery store, he buys eggs by the dozen. Likewise, when chemists deal with atoms and molecules, they need a convenient unit that takes into consideration the very small size of atoms and molecules. They use a unit called the mole.
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15 نوعا من الأطعمة تساعدك على ترطيب جسمك خلال موجة الحر
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"ناسا" تختار شركة "سبيس إكس" لـ"مهمة خاصة" في 2030
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بالصور: بمناسبة عيد الغدير الاغر.. قراءة خطبة النبي الأكرم (ص وآله) بالمسلمين في يوم (غدير خم)
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